My electric bill, which I pay a $100 per pay period, regardless of how much I owe. It builds up in the summer and goes down in winter. My prior bill had me $500 in the hole, plus late charges. My latest bill had about $600 in credits over a bunch of months.

They screwed up and refused to acknowledge their error. Think of the logic of a computer system. I'm an outlier, not a part of the system, so I am now excluded.

Then add in that I have a choice to use an aircard or satellite system at home. My aircard is saying that my signal strength is low, after over 15 months. Going to a satellite system will double my costs. And I still have to trust that the cloud wasn't changed when I wasn't looking.

1) Security: With the revelations about the NSA and corporations, plus the fact that many of the encryption standards may be compromised and much of the hardware/software is probably backdoored, do you trust anyone else with your data?

2) Uptime: If the SaaS goes down you are down and have no control of when it's up.

3) Billing and license costs. The cloud may be good if you do need to spin up large machines for specific season or jobs, but you still are paying for it. If you can't afford the expense of admins, you are at the services mercy to admin for you. If you are locked in to a specific service/configuration what happens when the Redmond license fairies give the gift of higher prices?

4) Goodwill of who's in control of your cloud. If the cloud provider decides to migrate or deprecate the software you need, what's your recourse? If you need to run additional software and they don't allow it, what's your recourse? If they are bought or decide to quit hosting the service, what's your recourse? Do they manage backups properly? Do you have enough bandwidth to back it up or load large data? Can you easily migrate?